Answer: x = -1, 15
Step-by-step explanation:
15 = x²- 14x
⇒ x²- 14x-15 = 0
⇒ x²- 15x+x-15 = 0
⇒ x (x-15) + (x-15) = 0
⇒ (x-15) (x+1) = 0
Now,
x= -1, 15
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